VA-26-239-01

Vulnerability from csaf_cisa - Published: 2026-08-27 19:51 - Updated: 2026-08-27 19:51
Summary
Redis TLS pending-data list use-after-free
Notes
Legal Notice: All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).
Countries and Areas Deployed: Worldwide
Critical Infrastructure Sectors: Information Technology
Risk Evaluation: Redis contains a use-after-free vulnerability in the 'tlsProcessPendingData()' function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server.
Recommended Practices: Fixed in Redis 8.2.9, 8.4.6, 8.6.6, 8.8.2, and 8.10.1.
Company Headquarters Location: United States
CVE-2026-81934
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-416 - Use After Free
Affected products
Product Identifier Version Remediation
Redis Redis 8.8.0
Redis / Redis
 8.8.0
Product Identifier Version Remediation
Redis Redis 8.2.9
Redis / Redis
 8.2.9
Vendor Fix fix
Redis Redis 8.4.6
Redis / Redis
 8.4.6
Vendor Fix fix
Redis Redis 8.6.6
Redis / Redis
 8.6.6
Vendor Fix fix
Redis Redis 8.8.2
Redis / Redis
 8.8.2
Vendor Fix fix
Redis Redis 8.10.1
Redis / Redis
 8.10.1
Vendor Fix fix
References
To clipboard 

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \\\"as is\\\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).",
        "title": "Legal Notice"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries and Areas Deployed"
      },
      {
        "category": "other",
        "text": "Information Technology",
        "title": "Critical Infrastructure Sectors"
      },
      {
        "category": "summary",
        "text": "Redis contains a use-after-free vulnerability in the \u0027tlsProcessPendingData()\u0027 function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server.",
        "title": "Risk Evaluation"
      },
      {
        "category": "general",
        "text": "Fixed in Redis 8.2.9, 8.4.6, 8.6.6, 8.8.2, and 8.10.1.",
        "title": "Recommended Practices"
      },
      {
        "category": "other",
        "text": "United States",
        "title": "Company Headquarters Location"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "https://www.cisa.gov/report",
      "issuing_authority": "CISA",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Vulnerability Advisory VA-26-239-01 CSAF",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-239-01.json"
      }
    ],
    "title": "Redis TLS pending-data list use-after-free",
    "tracking": {
      "current_release_date": "2026-08-27T19:51:09Z",
      "generator": {
        "engine": {
          "name": "VINCE-NT",
          "version": "1.15.0+build.116"
        }
      },
      "id": "VA-26-239-01",
      "initial_release_date": "2026-08-27T19:51:09Z",
      "revision_history": [
        {
          "date": "2026-08-27T19:51:09Z",
          "number": "1.0.0",
          "summary": "Initial publication"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "8.8.0",
                "product": {
                  "name": "Redis Redis 8.8.0",
                  "product_id": "CSAFPID-0001"
                }
              },
              {
                "category": "product_version",
                "name": "8.2.9",
                "product": {
                  "name": "Redis Redis 8.2.9",
                  "product_id": "CSAFPID-0002"
                }
              },
              {
                "category": "product_version",
                "name": "8.4.6",
                "product": {
                  "name": "Redis Redis 8.4.6",
                  "product_id": "CSAFPID-0003"
                }
              },
              {
                "category": "product_version",
                "name": "8.6.6",
                "product": {
                  "name": "Redis Redis 8.6.6",
                  "product_id": "CSAFPID-0004"
                }
              },
              {
                "category": "product_version",
                "name": "8.8.2",
                "product": {
                  "name": "Redis Redis 8.8.2",
                  "product_id": "CSAFPID-0005"
                }
              },
              {
                "category": "product_version",
                "name": "8.10.1",
                "product": {
                  "name": "Redis Redis 8.10.1",
                  "product_id": "CSAFPID-0006"
                }
              }
            ],
            "category": "product_name",
            "name": "Redis"
          }
        ],
        "category": "vendor",
        "name": "Redis"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-81934",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Redis contains a use-after-free vulnerability in the \u0027tlsProcessPendingData()\u0027 function, which handles the TLS pending-data list if Redis is configured with TLS support. A remote, unauthenticated attacker may be able to execute arbitrary commands with the privileges of the Redis server. Fixed in Redis 8.2.9, 8.4.6, 8.6.6, 8.8.2, and 8.10.1.",
          "title": "Description"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:P/A:N/T:T/2026-08-27T19:12:51Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006"
        ],
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        },
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/v12-security/pocs/tree/main/redis/server_ssl"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/redis/redis/8.2/00-RELEASENOTES"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/redis/redis/8.4/00-RELEASENOTES"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/redis/redis/8.6/00-RELEASENOTES"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/redis/redis/8.8/00-RELEASENOTES"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/redis/redis/8.10/00-RELEASENOTES"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-239-01.json"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-81934"
        }
      ],
      "release_date": "2026-08-17T00:00:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-17T00:00:00Z",
          "details": "Fixed in 8.2.9.",
          "product_ids": [
            "CSAFPID-0002"
          ],
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-17T00:00:00Z",
          "details": "Fixed in 8.4.6.",
          "product_ids": [
            "CSAFPID-0003"
          ],
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-17T00:00:00Z",
          "details": "Fixed in 8.6.6.",
          "product_ids": [
            "CSAFPID-0004"
          ],
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-17T00:00:00Z",
          "details": "Fixed in 8.8.2.",
          "product_ids": [
            "CSAFPID-0005"
          ],
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-17T00:00:00Z",
          "details": "Fixed in 8.10.1.",
          "product_ids": [
            "CSAFPID-0006"
          ],
          "url": "https://github.com/redis/redis/commit/6d088c335d5c3ec49a6c28486140b498e70b7834"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "title": "Redis TLS pending-data list use-after-free"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.